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phyllite
Phyllite is a technical term used primarily in geology to describe a specific grade of metamorphic rock. It is distinguished from slate by its characteristic silky or pearly luster, which results from the growth of larger mica crystals during the metamorphism process. This gives the rock a wavy or wrinkled appearance known as crenulation.
In a professional geological context, the term is used to pinpoint a precise stage of regional metamorphism. It occupies a middle ground in the metamorphic sequence: it is more altered than slate but less crystalline than schist. Because it describes a material substance, it is typically treated as an uncountable mass noun when referring to the rock type in general.
Meanings
Examples
The sample of phyllite exhibits a characteristic silky luster.
The sample of phyllite exhibits a characteristic silky luster.
Phyllite is often found in regions that have undergone intense regional metamorphism.
I wonder if this outcrop is actually phyllite or just a fine grained schist.
The geologist noted that the phyllite layer was heavily folded.
This rock is too shiny to be slate but not coarse enough to be schist so it must be phyllite.
The mountain ridge consists primarily of weathered phyllite.
We are studying the transition from slate to phyllite in this sequence.